Printing 6 or so.  Also available are errata for printings 1 and 9, and for the first year.
Errata for

Bjarne Stroustrup:
The C++ Programming Language (2nd edition)

Addison-Wesley, 1991, ISBN0-201-53992-6, printing 6 or so.
pg 45  Of the definitions only
	char ch;
	complex cvar;
do not specify values. ...

pg 47
	int a = 1;

	void f()
	{
	    int b = 1;		// initialized at each call of f()
	    static int c = a;	// initialized once only
	    cout << " a = " << a++
		 << " b = " << b++
		 << " c = " << c << '\n';
	    c = c + 2;
	}

	int main()
	{
	    while (a < 4) f();
	}
and fix the output to match

pg 131 // invoke pow(double,double)

pg 166  s/task_chain/chain/trice

pg 167  third line s/};/}/

pg 239  X& operator=(const X&);

pg 268  s/T* Slist_iter::operator()()/template<class T> T* Slist_iter::operator()()/

pg 273  s/inline// twice

pg 334-335
int s = cin.rdstate(); // returns a set of io_state bits

if (s & ios::goodbit) {
    // the last operation on cin succeeded
}
else if (s & ios::badbit) {
    // cin characters possibly lost
}
else if (s & ios::failbit) {
    // some kind of formatting error, probably not too bad
}
else if (s & ios::eofbit) {
    // at end of file
}

pg 341  s/};/}/

pg 351  s/output/input/

pg444  s/ref_cast(dialog_box,db)/ref_cast(dbox_w_string,db)/

pg 472  s/Handle(const T* pp)/Handle(T* pp)/

pg 309  s/Public/public/

pg 314  s/(int size)/(int sz)/

pg 314  s/Vector v(i)/ Vector (i)/

pg 338  s/rdstate();/rdstate()/

pp 398,399  s/virtual void/public: virtual void/

pg 408  s/underflow(T)/underflow()/

pg 424  s/}/};/

pg 339  s/<< '(' << 12/<< 12/

p.340  dec=020; //octal  =>  dec=020; //decimal
oct=040; //decimal => oct=040; //octal

pg 349  s/char file[n-1];/char file[n];/

pg 357  s/[-]d.ddde+dd/[-]d.ddde<plus or minus>dd/

pg 451  s/D* pb = (D*)pb;/D* pd = (D*)pb;/

pg 474
Pool::Pool(unsigned sz)
   : esize(sz<sizeof(Link*)?sizeof(Link*):sz)
{
    head = 0;
}

To track new developments, both the Annotated Reference Manual and Bjarne Stroustrup's book have an identical ``extra'' chapter that is updated a couple of times a year.  Its most recent version and the most recent errata sheet are available from Software, Tool & Die's ftp server in directory AW/stroustrup2e.
Thanks to Bjarne Stroustrup (bs@research.att.com) for errata and pointer.
Markup, etc. by jutta@pobox.com, corrections and comments welcomed.